Former National Football League running back and actor has spent nine years in prison for his role in the September 2007 armed robbery of two sports memorabilia dealers at a Las Vegas resort and will walk out of prison in October.

OJ Simpson reacts during his parole hearing at Lovelock Correctional Centre in Lovelock, Nevada, U.S. July 20, 2017.

OJ Simpson was granted parole from prison on Thursday after serving nine years for a botched armed robbery in a Las Vegas hotel room and will be released in October.

A four member Nevada parole board voted to release 70-year-old former star athlete, who was acquitted in a sensational double-murder trial that gripped America two decades ago, after an often emotional hearing that included testimony from his daughter and one of the victim.

Simpson participated in the proceedings by live video feed from Lovelock Correctional Center, about 100 miles (161 km) from the parole board's office in Carson City.

He bowed his head and appeared to be in tears as the four-member board voted unanimously to grant parole. He then stood and clasped his hands as he thanked them repeatedly.

"I've done my time, I've done it as well and respectfully as anyone can," Simpson said during his testimony. "None of this would have happened if I'd had better judgment."

Among reasons, the board gave for its decision was that Simpson had complied with prison rules during his incarceration, had no prior criminal convictions and posed a minimal safety risk to the public.

Simpson said he was ready for life outside prison, to spend time with his children and friends and could handle the public attention he would get on the outside.

"I'm not a guy that has conflicts in the street, I don't expect to have any when I leave here," he told the parole board. Bruce Fromong, a robbery victim, said Simpson was "a good man" who made a mistake and should now be released as he deserved "a second chance."

During the hearing, board members also heard testimony from Simpson's adult daughter, Arnelle, and from Bruce Fromong, one of two sports memorabilia dealers he was convicted of robbing at gunpoint on September 13, 2007.